singletonbeancontainer.java

一个简单的java邮件系统源码

package com.easyjf.container.impl;

import java.util.Collection;
import java.util.Map;
import java.util.TreeMap;

import com.easyjf.util.Assert;
import com.easyjf.web.exception.FrameworkException;

public class SingletonBeanContainer {
	private Map beans=new TreeMap();	
	public boolean containsSingletonBean(String name) {	
		return beans.containsKey(name);
	}

	public Object getSingletionBean(String name) {	
		return beans.get(name);
	}

	public Object getSingletionBean(Class type) {
		java.util.Iterator it=beans.values().iterator();
		Object ret=null;
		int i=0;
		while(it.hasNext())
		{
			Object obj=it.next();
			if(obj.getClass()==type)
			{
				ret=obj;
				i++;
				if(i>1)throw new FrameworkException("容器中有多个同类型的Bean，无法确定返回哪一个！");
			}			
		}
		return ret;
	}

	public void register(String name, Object bean)
	{
		Assert.hasText(name);
		Assert.notNull(bean);
		synchronized(this.beans){
		if(!containsSingletonBean(name)) //throw new com.easyjf.web.exception.FrameworkException("指定的Bean已经存在！"+name);
		beans.put(name, bean);
		}
	}
	public void removeBean(String name)
	{
		beans.remove(name);
	}
	public void removeBean(Class type)
	{
		Object bean=getSingletionBean(type);
		beans.values().remove(bean);		
	}
	public void removeAll()
	{
		beans.clear();	
	}
}